FAST_PATH_PORTS

   (Alpha and Integrity servers) FAST_PATH_PORTS is a static
   parameter that deactivates Fast Path for specific drivers.

   FAST_PATH_PORTS is a 32-bit mask, with a bit assigned for each
   Fast Path port driver. The following table describes the bit
   values:

   Bit
   Value    Description

   1        Indicates that Fast Path is disabled for ports serviced
            by the corresponding driver.

   0        Indicates that Fast Path is not disabled for ports
            serviced by the corresponding driver.

   Beginning in OpenVMS Version 7.3-1, values of specific bit
   positions are those described in the following table:

   Bit
   Position Description

   0        Controls Fast Path for PKQDRIVER (for parallel SCSI).

   1        Controls Fast Path for FGEDRIVER (for Emulex LP7000,
            LP8000, LP9002, LP9802, LP10000 FibreChannel).

   2        Controls Fast Path for PKADRIVER (for Adaptec AIC-78xx
            Ultra3 SCSI).

   3        Controls Fast Path for PEDRIVER (for LAN).

   4        Controls Fast Path for PKRDRIVER (for SMART Array 5300).

   5        Controls Fast Path for PKMDRIVER, the LSI Logic
            LSI53C1030 SCSI port driver.

   6        Controls Fast Path for PGQDRIVER, the Qlogic ISP23xx
            FibreChannel port driver.

   Currently, the default setting for FAST_PATH_PORTS is 0, which
   means that Fast Path is enabled for all drivers that appear in
   the table.

   In addition, note the following:

   o  CI drivers are not controlled by FAST_PATH_PORTS. Fast Path
      for CI is enabled and disabled exclusively by the FAST_PATH
      system parameter.

   o  FAST_PATH_PORTS is relevant only if the FAST_PATH system
      parameter is enabled (equal to 1). Setting FAST_PATH to zero
      has the same effect as setting all the bits in FAST_PATH_PORTS
      to 1.

   For additional information, see FAST_PATH. For an explanation of
   how to set the bits, see the OpenVMS I/O User's Reference Manual.